/Engine/Plugins/Runtime/GeometryCache/Source/GeometryCache/Classes/GeometryCacheTrackStreamable.h
Begin coding and set the codec to use for this track. The passed in codec object is assumed to be exclusive to this track.
void BeginCoding ( [UGeometryCacheCodecBase](API\Plugins\GeometryCache\UGeometryCacheCodecBase) * SetCodec, bool bForceSingleOptimization, bool bCalculateAndStoreMotionVectors, bool bOptimizeIndexBuffers )